Tutorial Playlist
200 Lessons1. Introduction to Python
2. Features of Python
3. How to install python in windows
4. How to Install Python on macOS
5. Install Python on Linux
6. Hello World Program in Python
7. Python Variables
8. Global Variable in Python
9. Python Keywords and Identifiers
10. Assert Keyword in Python
11. Comments in Python
12. Escape Sequence in Python
13. Print In Python
14. Python-if-else-statement
15. Python for Loop
16. Nested for loop in Python
17. While Loop in Python
18. Python’s do-while Loop
19. Break in Python
20. Break Pass and Continue Statement in Python
21. Python Try Except
22. Data Types in Python
23. Float in Python
24. String Methods Python
25. List in Python
26. List Methods in Python
27. Tuples in Python
28. Dictionary in Python
29. Set in Python
30. Operators in Python
31. Boolean Operators in Python
32. Arithmetic Operators in Python
33. Assignment Operator in Python
34. Bitwise operators in Python
35. Identity Operator in Python
36. Operator Precedence in Python
37. Functions in Python
38. Lambda and Anonymous Function in Python
39. Range Function in Python
40. len() Function in Python
41. How to Use Lambda Functions in Python?
42. Random Function in Python
43. Python __init__() Function
44. String Split function in Python
45. Round function in Python
46. Find Function in Python
47. How to Call a Function in Python?
48. Python Functions Scope
49. Method Overloading in Python
50. Method Overriding in Python
51. Static Method in Python
52. Python List Index Method
53. Python Modules
54. Math Module in Python
55. Module and Package in Python
56. OS module in Python
57. Python Packages
58. OOPs Concepts in Python
59. Class in Python
60. Abstract Class in Python
61. Object in Python
62. Constructor in Python
63. Inheritance in Python
64. Multiple Inheritance in Python
65. Encapsulation in Python
66. Data Abstraction in Python
67. Opening and closing files in Python
68. How to open JSON file in Python
69. Read CSV Files in Python
70. How to Read a File in Python
71. How to Open a File in Python?
72. Python Write to File
Now Reading
73. JSON Python
74. Python JSON – How to Convert a String to JSON
75. Python JSON Encoding and Decoding
76. Exception Handling in Python
77. Recursion in Python
78. Python Decorators
79. Python Threading
80. Multithreading in Python
81. Multiprocеssing in Python
82. Python Regular Expressions
83. Enumerate() in Python
84. Map in Python
85. Filter in Python
86. Eval in Python
87. Difference Between List, Tuple, Set, and Dictionary in Python
88. List to String in Python
89. Linked List in Python
90. Length of list in Python
91. Reverse a List in Python
92. Python List remove() Method
93. How to Add Elements in a List in Python
94. How to Reverse a List in Python?
95. Difference Between List and Tuple in Python
96. List Slicing in Python
97. Sort in Python
98. Merge Sort in Python
99. Selection Sort in Python
100. Sort Array in Python
101. Sort Dictionary by Value in Python
102. Datetime Python
103. Random Number in Python
104. 2D Array in Python
105. Abs in Python
106. Advantages of Python
107. Anagram Program in Python
108. Append in Python
109. Applications of Python
110. Armstrong Number in Python
111. Assert in Python
112. Binary Search in Python
113. Binary to Decimal in Python
114. Bool in Python
115. Calculator Program in Python
116. chr in Python
117. Control Flow Statements in Python
118. Convert String to Datetime Python
119. Count in python
120. Counter in Python
121. Data Visualization in Python
122. Datetime in Python
123. Extend in Python
124. F-string in Python
125. Fibonacci Series in Python
126. Format in Python
127. GCD of Two Numbers in Python
128. How to Become a Python Developer
129. How to Run Python Program
130. In Which Year Was the Python Language Developed?
131. Indentation in Python
132. Index in Python
133. Interface in Python
134. Is Python Case Sensitive?
135. Isalpha in Python
136. Isinstance() in Python
137. Iterator in Python
138. Join in Python
139. Leap Year Program in Python
140. Lexicographical Order in Python
141. Literals in Python
142. Matplotlib
143. Matrix Multiplication in Python
144. Memory Management in Python
145. Modulus in Python
146. Mutable and Immutable in Python
147. Namespace and Scope in Python
148. OpenCV Python
149. Operator Overloading in Python
150. ord in Python
151. Palindrome in Python
152. Pass in Python
153. Pattern Program in Python
154. Perfect Number in Python
155. Permutation and Combination in Python
156. Prime Number Program in Python
157. Python Arrays
158. Python Automation Projects Ideas
159. Python Frameworks
160. Python Graphical User Interface GUI
161. Python IDE
162. Python input and output
163. Python Installation on Windows
164. Python Object-Oriented Programming
165. Python PIP
166. Python Seaborn
167. Python Slicing
168. type() function in Python
169. Queue in Python
170. Replace in Python
171. Reverse a Number in Python
172. Reverse a string in Python
173. Reverse String in Python
174. Stack in Python
175. scikit-learn
176. Selenium with Python
177. Self in Python
178. Sleep in Python
179. Speech Recognition in Python
180. Split in Python
181. Square Root in Python
182. String Comparison in Python
183. String Formatting in Python
184. String Slicing in Python
185. Strip in Python
186. Subprocess in Python
187. Substring in Python
188. Sum of Digits of a Number in Python
189. Sum of n Natural Numbers in Python
190. Sum of Prime Numbers in Python
191. Switch Case in Python
192. Python Program to Transpose a Matrix
193. Type Casting in Python
194. What are Lists in Python?
195. Ways to Define a Block of Code
196. What is Pygame
197. Why Python is Interpreted Language?
198. XOR in Python
199. Yield in Python
200. Zip in Python
In the world of programming, file manipulation is a fundamental skill. Python, a versatile and powerful language, offers many tools for working with files. In this article, we will focus on a critical aspect of file handling: writing to files along with write() method and the tell() method, which plays a pivotal role in understanding the file's position.
Writing data to a file is a common operation in Python. It opens up data persistence, logging, configuration management, and more possibilities. By mastering the art of writing files, you gain the ability to store data efficiently and retrieve it when needed.
At the heart of writing to a file in Python lies the write() method. This method allows you to send data into a file, creating or overwriting its contents. Whether you're saving textual data, numerical records, or complex data structures, the write() method empowers you to store information systematically.
For instance, you can write a simple text string to a file as follows:
The code here opens a file called 'sample.txt' and writes the string "Hello, Python!" into it. You can write large datasets, structured data, or even binary data with the write() method.
The tell() method allows you to inquire about the current position of the file pointer within the file. This is crucial when dealing with large datasets or complex file structures.
Imagine a long book with numerous chapters, and you want to resume reading from where you left off. The tell() method is like a bookmark that tells you exactly which page you're on. It helps you keep track of your position within the file.
Together, the write() and tell() methods equip you with the skills to create, update, and navigate files effectively. In the subsequent sections, we'll explore these in greater detail, exploring various use cases and examples to improve your understanding.
So, let's explore Python's file handling capabilities and learn how to write data to files and tell precisely where you are within those files.
Text files are a fundamental part of data storage and retrieval in Python, as they allow you to store and manipulate human-readable text data. In this section, we'll explore how to write to text files using Python and how the tell() method can help you navigate and understand your position within these files.
Python provides a straightforward way to write data to text files using the open() function in conjunction with the write() method.
Here's a basic example:
In this example, we've opened a file called 'example.txt' in write mode ('w') and used the write() method to add two lines of text to it. The '\n' character represents a line break.
You can write not only plain text but also structured data, such as CSV or JSON, to text files. This is incredibly useful for tasks like data logging, configuration management, or generating reports.
The tell() method becomes particularly important when dealing with large text files or when you need to navigate within a file accurately. It returns the current position of the file pointer within the file. Let's see how it works:
In this code snippet, we've opened 'example.txt' in read mode ('r') and used tell() to determine the initial position of the file pointer. This information can be essential when you want to read or write data at specific locations within the file.
Whether you're appending data to an existing text file, extracting specific sections, or monitoring your progress within a lengthy log file, the tell() method is a valuable tool. It helps you maintain control over your file operations, ensuring that you read or write data precisely where you intend to.
In the next sections, we'll explore additional examples and use cases, further solidifying your understanding of writing to text files and effectively using the tell() method to your advantage.
Python provides a versatile approach to writing data to binary files, enabling you to work with complex and non-textual data. The open() function, in combination with the write() method, facilitates this process. Consider the following example:
In this example, we've opened a file named 'binary_data.bin' in binary write mode ('wb'). We then used the write() method to input a sequence of bytes (in this case, representing the string "Hello"). Binary files are versatile and can store a wide range of data, including images, audio, video, and serialized objects.
Understanding your position within a binary file is vital, especially when dealing with complex data structures or when you need to update specific segments of the file. Python's tell() method comes to your aid. It returns the current position of the file pointer within the binary file. Observe how it operates:
In this code snippet, we've opened 'binary_data.bin' in binary read mode ('rb') and employed tell() to identify the initial position of the file pointer. This knowledge is indispensable when reading or writing data at precise locations within the binary file.
Whether you're appending data to an existing binary file, extracting specific data structures, or monitoring your progress within a complex binary data file, the tell() method proves invaluable. It grants you control over your binary file operations, ensuring accuracy and precision in your data manipulations.
In the subsequent sections, we'll explore additional examples and use cases, further strengthening your proficiency in writing to binary files and effectively employing the tell() method in Python.
The tell() method in Python is a crucial tool for file handling, enabling you to determine the current position of the file pointer within a file. This method is often used in conjunction with the seek() method, which allows you to navigate, read, and write data to precise locations within a file. Let's explore the tell() method in detail.
Usage of tell() with seek(): While the seek() method is used to move the file pointer to a specific position within the file, the tell() method helps you keep track of its current location. Here's an example that demonstrates this interplay
In this example, we first use tell() to determine the initial position of the file pointer. After using seek() to move the pointer to position 20, we again use tell() to verify the new position.
Difference Between seek() and tell(): The primary difference between seek() and tell() is that seek() changes the file pointer's position, while tell() merely reports its current position.
Use Cases of tell(): The tell() method is invaluable when you need to append data to a file, navigate within large files, or keep track of your position during complex file operations. It ensures precision and control in your file manipulations.
In summary, the tell() method in Python provides insight into the current file pointer position, making it an indispensable tool for accurate file handling, especially when combined with seek() for more advanced file navigation and manipulation.
When writing to a file in Python, it's crucial to understand where the file handle is positioned before any data is written. The tell() method allows us to determine the current file handle position. Let's explore this using an example:
In this code snippet, we begin by opening a text file named 'output.txt' in write mode ('w'). We use the tell() method to check the initial position of the file handle, which is typically at the beginning of the file.
Next, we perform a write operation by using the write() method to add the string "Hello, Python!" to the file. After this operation, we again employ tell() to identify the position of the file handle. This allows us to confirm that it has moved to the position immediately after the write operation.
By displaying the positions before and after writing, we can ensure that data is written to the file correctly. This example demonstrates how the tell() method is valuable for tracking the file handle's location before and after writing operations, ensuring precise file manipulations when writing data in Python.
In the realm of Python file handling, knowing the exact location of the file handle after reading data from a file is paramount for precise navigation and manipulation. This is where the tell() method proves invaluable, particularly when combined with the seek() method. Let's explore this concept with a practical example:
In this code example, we initiate by opening the 'sample.txt' file in read mode ('r'). We first employ the tell() method to ascertain the initial file handle position, typically set at the beginning of the file.
Subsequently, we execute a read operation, specifically reading the first 50 characters from the file. After this operation, we once again use the tell() method to reveal the current position of the file handle.
By displaying both the positions before and after reading, we clearly understand how the tell() method can accurately track the file handle's movement. It enables us to discern that the file handle has shifted to the position immediately following the read operation.
This example underscores the significance of the tell() method in monitoring file handle positions during read operations. It empowers you to maintain precision and control over your file manipulations, ensuring you know the exact location within the file where data was read.
Binary files are a versatile medium for storing a wide range of data, including images, audio, and serialized objects. In this example, we'll delve into the world of binary files, highlighting the role of the tell() method and the seek() method in tracking and modifying the file handle's position within a binary file. We'll use relevant keywords such as "seek and tell method in Python," "seek() in Python," and "tell() is a method of."
In this code snippet, we begin by creating a binary file named 'binary_data.bin' in write mode ('wb'). Initially, we use the tell() method to establish the starting position of the file handle, typically at the file's beginning.
Following that, we perform a write operation, adding binary data to the file, which, in this case, represents the string "Hello." We leverage the write() method for this purpose.
After the write operation, we use the tell() method once again to determine the file handle's new position. This showcases how the tell() method allows us to precisely monitor changes in the file handle's position after writing data to a binary file.
The example emphasizes how the combination of the tell() and seek() methods is vital for navigating, updating, and maintaining control over binary files. It ensures that you can work with binary data effectively and accurately.
In the world of Python file handling, mastering the art of writing to files and understanding the file handle's position are fundamental.
Three practical examples demonstrate the importance of the tell() method. We explored how it tracks the file handle's position before and after reading or writing operations, ensuring precision and control in file manipulations.
As you navigate the world of Python file handling, remember that the tell() method, combined with the seek() method, empowers you to create, update, and navigate through files effectively. These skills are invaluable for tasks like data persistence, log management, and more.
In conclusion, by mastering Python's file-handling capabilities, you not only gain the ability to write data to files but also become proficient at telling precisely where you are within those files, making you a more versatile and skilled programmer.
1. What is the primary purpose of the tell() method in Python file handling?
The primary purpose of the tell() method is to determine the current position of the file handle within a file. It helps programmers track and understand the file handle's location, which is vital for accurate file operations.
2. How does the seek() method differ from the tell() method in Python file handling?
The seek() method is used to move the file handle to a specific position within a file, whereas the tell() method only reports the current position of the file handle without changing it. They work together to navigate and manipulate files effectively.
3. Can the tell() method be used with both text and binary files in Python?
Yes, the tell() method is versatile and can be used with both text and binary files. It provides information about the file handle's position, making it useful for various file manipulation tasks.
4. How can I utilize the tell() method in real-world applications?
The tell() method is valuable in scenarios where you need to maintain precise control over file operations, such as appending data, extracting specific content, or monitoring progress within large files. It ensures accuracy in file manipulations.
PAVAN VADAPALLI
Director of Engineering
Director of Engineering @ upGrad. Motivated to leverage technology to solve problems. Seasoned leader for startups and fast moving orgs. Working …Read More
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upGrad does not grant credit; credits are granted, accepted or transferred at the sole discretion of the relevant educational institution offering the diploma or degree. We advise you to enquire further regarding the suitability of this program for your academic, professional requirements and job prospects before enr...